无法使用html格式传输对象数组

i have a little problem with my program and not so experienced in php. I want to transfer an array of objects with a html form to my php file. First i will let you take a look on my code:

location.php (with executable forms)

<form action="action/add_items.php" method="POST">
        <table border="1" width="20%">
            <thead>
            <th>
                <?= $lang["location_task"][$location->getProperty("location_id")][$location_task->getProperty("location_task_id")]; ?>
            </th>
            </thead>
            <tbody>
            <?php
            $location_task_items = $location_task->getProperty("location_task_items");

            foreach ($location_task_items as $location_task_item) {
                ?>
                <tr>
                    <td>
                        <?= $lang["item"][$location_task_item->getProperty("location_task_item_id")]; ?>
                    </td>
                    <td>
                        <?= $location_task_item->getProperty("location_task_item_value"); ?>
                    </td>
                </tr>
            <?php
            }
            ?>
            <tr>
                <td></td>
                <td>
                    <input type="hidden" value="<?php print_r($location_task_items); ?>" name="location_task_items"/>
                    <input type="submit" value="start"/>
                </td>
            </tr>
            </tbody>
        </table>
    </form>

You can see that i only print the array in the input hidden value. Is that right?

add_items.php

$location_task_items = $_REQUEST["location_task_items"];

foreach($location_task_items as $location_task_item) {
    if($Player_Has_ItemsClass->getObjectByIds($player_id, $location_task_item->getProperty("location_task_item_id")) == null) {
        $player_has_items_attributes = array();
        $player_has_items_attributes["player_has_items_player_id"] = $player_id;
        $player_has_items_attributes["player_has_items_item_id"] = $location_task_item->getProperty("location_task_item_id");
        $player_has_items_attributes["player_has_items_item_value"] = $location_task_item->getProperty("location_task_item_value");

        $player_has_items = new Player_Has_Items($player_has_items_attributes);

        $Player_Has_ItemsClass->insertObject($player_has_items);
    } else {

    }
}

I only get the array as string and this exception on the foreach in add_items.php:

Invalid argument supplied for foreach()

I also tried it with json_encode and json_decode:

print_r(json_encode($location_task_items))
json_decode($_REQUEST["location_task_items"]);

but only get (object attributes were public):

Call to undefined method stdClass::getProperty()

Thanks for you help :)

In your hidden field use json_encode and then in your destination use json_decode:

 <input `type="hidden" value='<?php echo json_encode($location_task_items); ?>' name="location_task_items"/>`

You could do this

<input type="hidden" value="<?php echo serialize($location_task_items); ?>" name="location_task_items"/>

and then

$location_task_items = unserialize($_REQUEST["location_task_items"]);